摘要为了解决传统内燃机汽车引起的各种问题，汽车制造商纷纷致力于更加清洁的新能源汽车，开发了多种发动机技术。
Abstract: in order to solve the problems caused by conventional cars, car manufacturers have committed to cleaner energy vehicles and the development of a variety of engine technology.
研发该技术的立法背景是，新能源汽车由于比内燃机汽车噪音小，因此法规要求新能源汽车必须要发出一定的声音来警告行人它们的存在。
Legislation will mean that alternative powertrain vehicles that make less noise than combustion engine vehicles will have to make a noise to warn pedestrians of their presence.
研发该技术的立法背景是，新能源汽车由于比内燃机汽车噪音小，因此法规要求新能源汽车必须要发出一定的声音来警告行人它们的存在。
Legislation will mean that alternative powertrain vehicles that make less noise than combustion engine vehicles will have to make a noise to warn pedestrians of their presence.
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